org.das2.util.filesystem.FileSystem.FileSystemOfflineException
Exception indicating the file system is off-line. For example, if the network is not
available, fresh listings of an http site cannot be accessed.
FileSystemOfflineException( )
FileSystemOfflineException( String message )
FileSystemOfflineException( java.io.IOException e )
FileSystemOfflineException( java.io.IOException e, java.net.URI root )